Carpenter&#39;s triangle.



J. GRUNDSTROM. GARPENTBR'S TRIANGLE. APPLICATION FILED DEO.17,1912.

Patented Aug. 4, 1914,

UlL-TTT .N m

LII

@Lui/tweeen 'PHILv NORRIS PETERS 00,. PllU'lO-LITHU.. WASHINGTON. D` L"JOHN GRUNDSTRONLOF BULLRUN, OREGON. i

CARPENTERS TRIANGLE.

Specieation of Letters Patent.

Patented Aug. 4, 1914.

Application filed December 17, 1912. Serial No. 737,321.

To all whom it may concern:

Be it` known that I, JOHN GRUNDs'rRoM, a citizen of the United States,residing at Bullrun, in the county of Clackamas and State of Oregon,have invented new and useful Improvements in Carpenters Triangles, ofwhich the following is a specification.

The general object of this invention is the provision of a carpenterstriangle having the hypotenuse thereof adjustable relative to the baseand the perpendicular member whereby various angles may be obtained,said triangle being so constructed as to be rendered foldable when notin use, and to this end the invention consists in providmg certain novelconstructions, arrangements and combinations of devices which will befully described hereinafter and then pointed out in the appended claims.

In carrying out the object `of the invention generally stated above, itwill be understood, of course, that the essential features thereof aresusceptible to changes in details and structural arrangements, onepreferred and practical embodiment being shown in the accompanyingdrawings, wherein Figure 1 is a plan View of the triangle constructed inaccordance with the invention. Fig. 2 is an edge elevation thereof. Fig.3 is a detailplan view partly in section of the hypotenuse and of theadjustable section of the hypotenuse. verse section on the line 4--4 ofFig. 1. Fig. 5 is a detail View of an adjusting pinion used inconnection with the adjustable section illustrated in Fig. 3. Fig. 6 isa detail sectional view on the line 6-6 of Fig. 1, showing the means forholding the base and the perpendicular member of the triangle inextended position. Fig. 7 is a detail perspective View of a lockingelement used for retaining the base and perpendicular members in afolded position. Fig. `8 is a plan view of the triangle in a foldedposition. Fig. 9 is a transverse section on the line 9-9 of Fig. 1showing the manner of connecting the hypotenuse to the perpendicularmember.

Referring more particularly to the ac` base member 10 is provided at itspivoted Fig. 4 is a trans` end with a bifurcation l2 including thesubstantially .semi-circular ears 13 which are adapted to ureceivetherebetween the reduced extension 14 of the perpendicular member 11when the said members are in their extended or operative position, a pin15 being passed transversely through the ears 13 and the reducedextension 14 whereby the said members are properly pivoted together. Themembers l0 and 11 are retained in their relative extended positions bymeans of a pin 16 which extends through the openings 17 formed in thebifurcated end 12 of the base member and the opening 18 formed inthereduced extension 14 of the perpendicular' member 11.

In the event that the pin 16 becomes lost or misplaced, an additionalmeans is provided for retaining the members in their extended positionand includes a leaf spring 19 one end of which is secured in anelongated recess 20 in the base member 10 while the other end is bent tofirst extend through an opening 2l contiguous to the recess 20 andengage a suitable notch 22 in the reduced end 14 of the perpendicularmember 11, said notch being adapted to register with the opening 21 whenthe members are in their extended position.

The perpendicular member 11 is provided with an elongated slot 23 havingthe bottom portion of its longitudinal walls beveled as indicated at 24in order to retain the enlarged head 25 of the pivot bolt 2G inengagement with said slot. The pivot bolt 26 is adapted to extendthrough the transverse slot 27 formed in the enlarged end 2S of thehypotcnuse member 29 of the triangle. The said bolt 26 is threaded uponits upper end in order to receive the nut 30 whereby the hypotenusemember 29 may be Secured in an adjusted position.

For a major portion of the length of the hypotenuse member 29 the sameis provide'd upon the longitudinal edges with the oppositely disposedguiding grooves 3l which are adapted to receive the reducedlongitudinally extending arms 32 of the longitudinally adjustablesection 38 of the said hypotenuse member. One of the arms 32 is providedwith the internal rack teeth 34 which are adapted to be engaged by thecooperating parts 35 of the pinion 36, the latter extending through atransverse opening adjacent one end of the member 29, said openingcommunicating with the groove 31 which receives the arm 32 upon whichthe rack teeth 312 are formed. It will thus be seen that upon rotationof the pinion 3G, the adjustable section 83 may be moved inwardly oroutwardly relative to the member r 29 whenever desired.

By removing the pin 1G and disengaging the spring 19 t'rom the notch 22,itwill be seen that the base and perpendicular members l0 and ll may beswung to the position illustrated in Fig. 8 of the drawings and saidmembers are retained in this position by means oit a locking element 37which comprises an elongated strip havinga pair of openings 38 and 39therein, said openings being of such a size as to receive, respectively,the base member l0 and the perpendicular member 12. @ne end o1 thelocking clement 37 is tapered indicated at 40 whereby the` same may beutilized as a screw driver.

Whatis claimed is zl. A device of the class described comprising a basemember, a perpendicular member pivotally connected thereto, means in`cluding a leaf spring for retaining said members in their extendedposition, a hypotenuse member formed with a transverse slot, saidperpendicular member being formed withalongitudinally extending slot,

Copies of this patent may be obtained for five cents each, by addressingmeans cooperating with both the said slots to connect the hypotenusemember and the perpendicular member for relative adjustment, saidhypotenuse member including a longitudinally adjustable section, andmeans including a pinion -t'or adjusting said section.

2. A carpenters triangle including a base member, a perpendicular memberpivotally connected thereto, means for retaining said 40 members intheir extended position, saidperpendicular member being formed with alongitudinally extending slot, a hypotenuse member formed with anenlargement inter mediate' its ends, said hypotenuse member 45 beingformed with a slot arranged transversely thereofand extending into theenlargement, and fastening means passing l through the slots of thehypotenuse member' and perpendicular member, whereby the hypotenusemembermay be adjusted longitudinally and obliquely with respect to theperpendicular member.

In testimony whereof I aitix my signature in presence of two witnesses.

` JOHN GRUNDSTROM.

Y lWitnesses:

J. H. INGRAM, Sims SAGE.

the Commissioner of Patents,

Washington, D. C.

